NUMEROUS ANTI-LOCK BRAKE (ABS) WHEEL SPEED SENSOR (WSS) DIAGNOSTIC TROUBLE CODES (DTC'S) C1145, C1155, C1175, C1296, C1297, C1298, C1299 AND C1222.
full bulletin at NHTSA ↗2005 Mercury Grand Marquis brakes problems
severe 14 complaints filed with NHTSA · avg repair $450 · see brakes across all vehicles →
Failure mileage
Complaints
14
Recalls
0
Avg fix
$450
3crashes
What stands out
Of the 5 model years of Mercury Grand Marquis we track for brakes problems, this one carries the most owner complaints on file — 14.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering brakes on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
PINPOINT TEST ERROR FOR FRONT WHEEL SPEED SENSORS - WORKSHOP ANNUAL UPDATE.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
The brake complaints on this Grand Marquis fall into several distinct categories, all documented as unresolved despite dealership visits.
Brake failure with unexpected acceleration is the most serious issue. Owners report the vehicle accelerating instead of braking during low-speed maneuvers like approaching stop lights, parking, and reversing. Several owners experienced total loss of braking control, with the vehicle traveling 10-20 feet past the intended stop point. One owner collided with a pickup truck during a red-light stop when brakes failed. The incidents are intermittent and typically brief (1-2 seconds), which makes them difficult for dealers to replicate—multiple owners report dealerships said they found nothing wrong.
Soft or sinking brake pedal occurs most often during startup and gear selection, with the pedal traveling all the way to the floor. This design flaw creates a second hazard: the pedals are positioned so close together that depressing a soft brake pedal easily results in hitting the accelerator simultaneously.
Pedal placement is itself a recurring complaint. Multiple owners and even a service technician confirmed the brake and accelerator are dangerously close, leading to accidental simultaneous pedal depression that causes forward lunge.
One owner discovered front inner brake pads making contact with the rotor only in a 1-inch strip, with rust and pitting covering the non-contact areas—suggesting a manufacturing defect in pad or caliper alignment.
A parking brake failure was also reported, with the vehicle rolling when jacked despite the brake being engaged.
Failure modes owners describe
Brake failure with unexpected acceleration
When braking, vehicle accelerates instead of decelerating, losing control. Typically occurs during low-speed maneuvers (parking, stop lights, reversing) and can occur multiple times or intermittently. Vehicle may lunge forward or lose stopping ability for 10-20 feet beyond intended stop point.
When: 18,000 miles and beyond; occurs during normal braking situations
Symptoms owners cite: Vehicle accelerates when brake pedal pressed; Loss of braking control; Vehicle lunges forward; Engine races when braking applied; Inability to stop at intended location; Incident may last 1-2 seconds or longer
Repairs/costs cited: Dealerships unable to replicate or diagnose issue in multiple cases. Power booster replacement attempted in at least one case without resolving the problem. Pedal pressure testing performed in one case showed low pressure but dealership deemed it not concerning enough for repair.
Brake pedal goes soft or to the floor
Brake pedal loses firmness and travels to the floor, especially during vehicle startup and gear selection. Creates risk of simultaneously contacting accelerator pedal due to close proximity of pedals.
When: Most often during startup and gear selection
Symptoms owners cite: Brake pedal goes to floor; Loss of pedal pressure; Intermittent pedal softness; Tires squeal when braking
Repairs/costs cited: Dealership service offered no solution in multiple cases despite repeated visits. Power booster replacement attempted without success in one documented case.
Pedal placement design hazard
Brake and accelerator pedals positioned too close together, making it easy to depress both simultaneously. Multiple owners and service technicians report this design creates safety risk for accidental acceleration during braking.
When: Throughout ownership; incidents at 18,000 miles and beyond
Symptoms owners cite: Pedals too close together; Accidental depression of accelerator when attempting to brake; Vehicle lunges forward during parking maneuvers; Collision with other vehicles during low-speed braking attempts
Repairs/costs cited: No repairs available; design issue. Technician confirmed experiencing same issue on Ford vehicles.
Brake pad wear and rotor contact failure
Front inner brake pads not making proper contact with rotor. Only 1-inch width of brake pad contacts rotor surface; remaining pad area never contacts. Extensive rust and pitting on non-contact rotor areas indicates pads never seated properly.
When: Design defect present from manufacture
Symptoms owners cite: Brake pads not fully contacting rotor; Reduced braking surface area; Rotor rust and pitting in non-contact areas
Repairs/costs cited: Owner noted this defect was unlike anything seen in years of vehicle servicing.
Parking brake failure
Parking brake does not hold vehicle securely when engaged. Vehicle rolled when jacked during tire service despite parking brake application.
When: In service; failure occurred at low vehicle speeds
Symptoms owners cite: Parking brake fails to hold vehicle; Vehicle rolls despite parking brake engagement
Repairs/costs cited: Owner had to use cylinder blocks under tires to prevent further movement during service.
Synthesized from 14 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 0 most recent
Had brakes trouble with your 2005 Mercury Grand Marquis?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the brakes problem on the 2005 Mercury Grand Marquis?
It's a meaningful issue. 14 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $450.
At what mileage does the brakes typically fail?
Across the 8 complaints that reported odometer mileage, most brakes failures cluster between 15,000 and 130,000 miles, with the median around 35,000. A quarter of owners report trouble before 15,000; a quarter make it past 130,000. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
What does it cost to fix?
Independent shops typically charge around $450 for brakes repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to brakes?
No active recalls currently cover brakes issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2005/Mercury/Grand Marquis.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.